.footer
  height: 1.8rem;
  width: 100%;
  position: fixed;
  bottom: 0;
  left: 0;
  border-top: 2px solid #ccc;
  background-color: #fff;
.footer-cont li
  float: left;
  width: 25%;
  height: 1.8rem;
  line-height: 1.8rem;
  font-size: 1.4rem;
  color: #ff8000;
  text-align: center;
.footer-cont li:active
  background-color: #ccc;
.footer-cont:after
  content: '';
  display: block;
  clear: both;
  width: 0;
  height: 0;
